The factory turbo on the RB25DET in R33 and R34 Skylines quickly becomes a bottleneck once boost or supporting modifications are added. The HKS GTIII-RS Sports Turbo Kit (11004-AN017) is a complete bolt-on upgrade that replaces the stock unit with a modern GTIII-RS turbo featuring a billet compressor wheel and Inconel turbine housing. Designed for both stock and built engines, it delivers significantly faster spool, sharper throttle response, and a much broader powerband while maintaining excellent street drivability.
Released in 2025, this kit elevates output from approximately 325 HP on stock internals up to 444 HP with reinforced engine components. The reinforced actuator, optimized flow, and included heat shielding allow for higher safe boost levels with reduced surge and better thermal management. The kit includes everything needed for installation: the GTIII-RS turbo, custom inlet/outlet pipes, water and oil lines, gaskets, adapter pipe, and full hardware — all engineered to match the factory footprint for straightforward fitment in R33 and R34 models.
At Terra Firma Automotive, we supply this genuine HKS GTIII-RS Sports Turbo Kit as a premium, high-performance upgrade for serious RB25DET builds. It transforms your engine into a more responsive and powerful unit while maintaining reliability for street and track use. For enthusiasts serious about single-turbo performance and maximizing RB25DET potential, this GTIII-RS kit is one of the most advanced and reliable options available.
- HKS GTIII-RS Sports Turbo Kit for R33 R34 RB25DET
- Billet compressor wheel and Inconel turbine housing
- Supports 325 HP on stock internals up to 444 HP on built engines
- Faster spool (500–1,000 RPM earlier) and sharper throttle response
- Reinforced actuator for stable high-boost operation
- Compact design matches OEM footprint for easy installation
- Includes turbo, custom pipes, heat shield, water/oil lines, gaskets & hardware
- Optimized for E85 and modern tuning setups
- Excellent mid-range torque with linear power delivery
- Reduced surge and improved durability under sustained boost
- Direct bolt-on replacement with professional tuning recommended
- Premium HKS engineering with proven real-world results
- Ideal for street and track RB25DET performance builds
- Transforms RB25 into a more responsive and powerful engine
- Trusted by Skyline enthusiasts for turbo performance and reliability
- ⚠️ Emissions / California Legal Disclaimer – Off-Road / Competition Use Only: This product is intended for off-road, competition, and track use only. It is not legal for sale or use on public roads or highways in California (or any other CARB-adopting state). For more information Click Here.
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